5.1) Activating EGFR mutation (G719X, exon 19 deletion, L858R, L861Q) from tumor tissue or cytology or circulating tumor DNA 5.2) Must have experienced clinical benefit from prior EGFR-TKI, according to the Jackman criteria (Jackman 2010) followed by systemic objective progression (RECIST) while on continuous treatment with EGFR-TKI